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If your data structure is fixed and out of your control, then the best way to do this is to use a recursive common table expression (CTE) like in this question. If you can change the structure then there are ways to make such queries considerably more efficient. What you have there is often called a "naive tree" - while it allows easy construction and easy ...


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It's not possible to save query plans "for all future sessions". Query plans are only ever saved for the current session. And only reused under a number of favorable conditions. Plans for ad-hoc SQL queries are not saved at all. All queries inside PL/pgSQL functions are treated like prepared statements. And there are more steps than just the query planning. ...



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